Class A C F I I And Class I S [Member] Annual Fund Operating Expenses - Class A, C, FI, I and Class IS - Western Asset Short Duration Municipal Income Fund |
Feb. 28, 2026 |
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|---|---|---|---|---|---|---|
| Prospectus [Line Items] | ||||||
| Fee Waiver or Reimbursement over Assets, Date of Termination | December 31, 2027 | |||||
| Class A | ||||||
| Prospectus [Line Items] | ||||||
| Management Fees (as a percentage of Assets) | 0.30% | |||||
| Distribution and Service (12b-1) Fees | 0.15% | |||||
| Other Expenses (as a percentage of Assets): | 0.17% | |||||
| Expenses (as a percentage of Assets) | 0.62% | |||||
| Fee Waiver or Reimbursement | (0.07%) | [1] | ||||
| Net Expenses (as a percentage of Assets) | 0.55% | |||||
| Class C | ||||||
| Prospectus [Line Items] | ||||||
| Management Fees (as a percentage of Assets) | 0.30% | |||||
| Distribution and Service (12b-1) Fees | 0.50% | |||||
| Other Expenses (as a percentage of Assets): | 0.16% | |||||
| Expenses (as a percentage of Assets) | 0.96% | |||||
| Fee Waiver or Reimbursement | [1] | |||||
| Net Expenses (as a percentage of Assets) | 0.96% | |||||
| Class I | ||||||
| Prospectus [Line Items] | ||||||
| Management Fees (as a percentage of Assets) | 0.30% | |||||
| Distribution and Service (12b-1) Fees | 0.00% | |||||
| Other Expenses (as a percentage of Assets): | 0.17% | |||||
| Expenses (as a percentage of Assets) | 0.47% | |||||
| Fee Waiver or Reimbursement | (0.07%) | [1] | ||||
| Net Expenses (as a percentage of Assets) | 0.40% | |||||
| Class FI | ||||||
| Prospectus [Line Items] | ||||||
| Management Fees (as a percentage of Assets) | 0.30% | |||||
| Distribution and Service (12b-1) Fees | 0.25% | |||||
| Other Expenses (as a percentage of Assets): | 0.29% | [2] | ||||
| Expenses (as a percentage of Assets) | 0.84% | |||||
| Fee Waiver or Reimbursement | (0.09%) | [1] | ||||
| Net Expenses (as a percentage of Assets) | 0.75% | |||||
| Class IS | ||||||
| Prospectus [Line Items] | ||||||
| Management Fees (as a percentage of Assets) | 0.30% | |||||
| Distribution and Service (12b-1) Fees | 0.00% | |||||
| Other Expenses (as a percentage of Assets): | 0.09% | |||||
| Expenses (as a percentage of Assets) | 0.39% | |||||
| Fee Waiver or Reimbursement | (0.04%) | [1] | ||||
| Net Expenses (as a percentage of Assets) | 0.35% | |||||
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